Unable to see images in arcgis-popup attachments in SDK 5

MKY — Thu, 05 Mar 2026 19:52:41 GMT

Image attachments are not showing in popup from a secured service. but clicking the link opens the image in a different tab.

If the additional parameters w&s are removed from img src, the image is visible.

Is there any work around?

Re: Unable to see images in arcgis-popup attachments in SDK 5

LaurenBoyd — Fri, 06 Mar 2026 17:03:46 GMT

Hi @MKY -

Would you be able to provide more details about your configuration? I tried reproducing the issue, but haven't been able to see what you're experiencing.

It looks like the request to the service with the attachments has a proxy URL appended to it. Is this a secure layer with the credentials saved in the item and that layer is being loaded in your application? Can you also confirm that this was working with the widget?

Re: Unable to see images in arcgis-popup attachments in SDK 5

MKY — Fri, 06 Mar 2026 19:52:22 GMT

I have an asp .NET core proxy to handle secured services, and it works fine. The proxy configuration has credentials. The problem happens on the widget too.

"allowedReferrers": [ "*" ], "tokenCacheMinutes": 59, "serverUrls": [ { "url": "https://maps2.dcgis.dc.gov/dcgis/", "username": "ccccc", "password": "ccccc", "tokenUrl": "https://maps2.dcgis.dc.gov/dcgis/tokens/generateToken", "referer": "requestip", "useAppPoolIdentity": false } }

I have a function to manually upload attachments.

private _uploadAttachment(feature: any) { //create form const attachmentForm = document.createElement("form"); attachmentForm.setAttribute("id", "attachmentForm"); attachmentForm.classList.add("esri-hidden"); let fileSelector = document.createElement("input"); fileSelector.setAttribute("id", "fileSelector"); fileSelector.setAttribute("type", "file"); fileSelector.setAttribute("name", "attachment"); fileSelector.setAttribute("accept", "image/*,video/*,application/pdf,application/msword,text/plain"); 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('fileSelector')?.addEventListener("change", (e) => { let uploadedFile = (e.target as any).files[0]; if (!uploadedFile) { let message = "No file has been selected."; this._errorDialogContent.innerHTML = message; this._errorDialog.open = true; return; } //examine file if there is a size requirement let result: any = this._validateUploadFile(uploadedFile); if (!result.isValidFile) { this._errorDialogContent.innerHTML = result.msg; this._errorDialog.open = true; return; } let reader = new FileReader(); reader.onload = (event) => { const arrayBuffer = (event.target as any).result; const byteArray = new Uint8Array(arrayBuffer); // Convert to Uint8Array let blob = new Blob([byteArray], { type: uploadedFile.type }); this._addAttachments(feature, blob, uploadedFile.name, uploadedFile.type); }; reader.onerror = () => { this.hideLoading(); this.showAlert("error", "Attachment upload has failed.", 5000); }; reader.onprogress = () => { this.showLoading(); }; reader.readAsArrayBuffer(uploadedFile); }); document.getElementById('fileSelector')?.click(); }

I useFeatureLayer.queryAttachments to show on a form the attachments with no problem.

2026-03-06_14-38-15.png

In popup it looks like this

2026-03-06_14-41-28.png

The only difference I see is that in the popup the image comes with additional parameters

2026-03-06_14-46-36.png

Appreciate any help on this.

Re: Unable to see images in arcgis-popup attachments in SDK 5

MKY — Mon, 04 May 2026 11:54:28 GMT

Is it possible to add a property to AttachmentQuery to control (disable) dynamic image resizing and scaling?

When using proxy and the w and s parameters prevent it from showing in the popup.

If there is a workaround, please post some samples

topic Re: Unable to see images in arcgis-popup attachments in SDK 5 in ArcGIS JavaScript Maps SDK Questions

Unable to see images in arcgis-popup attachments in SDK 5

Re: Unable to see images in arcgis-popup attachments in SDK 5

Re: Unable to see images in arcgis-popup attachments in SDK 5

Re: Unable to see images in arcgis-popup attachments in SDK 5