topic Feature attachment for large file returns 500 error in ArcGIS JavaScript Maps SDK Questions

topic Feature attachment for large file returns 500 error in ArcGIS JavaScript Maps SDK Questions https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/feature-attachment-for-large-file-returns-500/m-p/1703753#M88471 <P>I have ArcGIS Server 11.5 with the following configuration:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="Setver setup.png" style="width: 999px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/152875i4EC063F7FFCC2BD4/image-size/large?v=v2&px=999" role="button" title="Setver setup.png" alt="Setver setup.png" /></span></P><P> </P><P> </P><P>I can upload feature attachments (up to 20MB) using the following function called popup action.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="popup action.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/152874iD3ADF610E0B63AE3/image-size/medium?v=v2&px=400" role="button" title="popup action.png" alt="popup action.png" /></span></P><P> </P><P>The function is:</P><LI-CODE lang="javascript"> function _addAttachment(feature: any) { //create form const attachmentForm = document.createElement("form"); attachmentForm.setAttribute("id", "attachmentForm"); let fileSelector = document.createElement("input"); fileSelector.setAttribute("id", "fileInput"); fileSelector.setAttribute("type", "file"); fileSelector.setAttribute("name", "attachment"); fileSelector.setAttribute("accept", "image/*,video/*,application/pdf"); let entInput = document.createElement("input"); entInput.setAttribute("name", "f"); entInput.setAttribute("value", "json"); attachmentForm.appendChild(fileSelector); attachmentForm.appendChild(entInput); document.body.appendChild(attachmentForm); document.getElementById('fileInput')?.addEventListener("change", (e) => { let uploadedFile = (e.target as any).files[0]; if (!uploadedFile) { let message = "No file has been selected."; (document.getElementById("calcite-error-content") as any).innerHTML = message; (document.getElementById("calcite-error-modal") as any).open = true; return; } const formData = new FormData(attachmentForm); console.log(formData); // The attachment is taken from the form. feature.layer.addAttachment(feature, formData).then((result: any) => { if (result.error === null) { alert("Attachment has been successfully uploaded."); } //delete form node document.body.removeChild(document.getElementById("attachmentForm") as any); }).catch((error:any) => { //delete form node document.body.removeChild(document.getElementById("attachmentForm") as any); console.log("attachment adding failed: ", error); alert("Attachment upload has failed."); }); }); document.getElementById('fileInput')?.click(); }</LI-CODE><P> </P><P>I tried for file size of 170MB and fails with 500 error code.</P><DIV>Interestingly, I can upload this using fearureTable add attachment.</DIV><DIV><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="ft attachment.png" style="width: 999px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/152876i2A1F2C4F68CE3378/image-size/large?v=v2&px=999" role="button" title="ft attachment.png" alt="ft attachment.png" /></span><P> </P>I appreciate for any work aroun</DIV><DIV> </DIV> Fri, 22 May 2026 11:24:46 GMT MKY 2026-05-22T11:24:46Z Feature attachment for large file returns 500 error https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/feature-attachment-for-large-file-returns-500/m-p/1703753#M88471 <P>I have ArcGIS Server 11.5 with the following configuration:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="Setver setup.png" style="width: 999px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/152875i4EC063F7FFCC2BD4/image-size/large?v=v2&px=999" role="button" title="Setver setup.png" alt="Setver setup.png" /></span></P><P> </P><P> </P><P>I can upload feature attachments (up to 20MB) using the following function called popup action.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="popup action.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/152874iD3ADF610E0B63AE3/image-size/medium?v=v2&px=400" role="button" title="popup action.png" alt="popup action.png" /></span></P><P> </P><P>The function is:</P><LI-CODE lang="javascript"> function _addAttachment(feature: any) { //create form const attachmentForm = document.createElement("form"); attachmentForm.setAttribute("id", "attachmentForm"); let fileSelector = document.createElement("input"); fileSelector.setAttribute("id", "fileInput"); fileSelector.setAttribute("type", "file"); fileSelector.setAttribute("name", "attachment"); fileSelector.setAttribute("accept", "image/*,video/*,application/pdf"); let entInput = document.createElement("input"); entInput.setAttribute("name", "f"); entInput.setAttribute("value", "json"); attachmentForm.appendChild(fileSelector); attachmentForm.appendChild(entInput); document.body.appendChild(attachmentForm); document.getElementById('fileInput')?.addEventListener("change", (e) => { let uploadedFile = (e.target as any).files[0]; if (!uploadedFile) { let message = "No file has been selected."; (document.getElementById("calcite-error-content") as any).innerHTML = message; (document.getElementById("calcite-error-modal") as any).open = true; return; } const formData = new FormData(attachmentForm); console.log(formData); // The attachment is taken from the form. feature.layer.addAttachment(feature, formData).then((result: any) => { if (result.error === null) { alert("Attachment has been successfully uploaded."); } //delete form node document.body.removeChild(document.getElementById("attachmentForm") as any); }).catch((error:any) => { //delete form node document.body.removeChild(document.getElementById("attachmentForm") as any); console.log("attachment adding failed: ", error); alert("Attachment upload has failed."); }); }); document.getElementById('fileInput')?.click(); }</LI-CODE><P> </P><P>I tried for file size of 170MB and fails with 500 error code.</P><DIV>Interestingly, I can upload this using fearureTable add attachment.</DIV><DIV><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="ft attachment.png" style="width: 999px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/152876i2A1F2C4F68CE3378/image-size/large?v=v2&px=999" role="button" title="ft attachment.png" alt="ft attachment.png" /></span><P> </P>I appreciate for any work aroun</DIV><DIV> </DIV> Fri, 22 May 2026 11:24:46 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/feature-attachment-for-large-file-returns-500/m-p/1703753#M88471 MKY 2026-05-22T11:24:46Z Re: Feature attachment for large file returns 500 error https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/feature-attachment-for-large-file-returns-500/m-p/1704578#M88479 <P>Error in my IIS setup of maxAllowedContentLength. increased to 2GB and works fine</P> Wed, 27 May 2026 10:50:53 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/feature-attachment-for-large-file-returns-500/m-p/1704578#M88479 MKY 2026-05-27T10:50:53Z