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Add attachment, status code 500

abureaux

Using the Add Attachment action in Power Automate, I am getting Status Code 500, which indicates a server issue.

"body": {
        "success": false,
        "message": "AxiosError: Request failed with status code 500. "
    }

This flow was working fine until last night, and nothing has changed on my server. I am also able to manually upload this file to the appropriate record myself:

I'm not sure what the issue would be on my end. Is this an Esri issue?

EDIT: It's worth noting that there are no errors in Server Manager, and everything else (e.g., flows and server tasks) is working properly.

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Accepted answers

abureaux

Okay, this is officially closed.

The fix: Modify the timestamp within the file name to remove all colons ":". You can do this within Power Automate via the formatDateTime() expression. E.g., formatDateTime(utcNow(),'yyyy-MMM-dd HH-mm-ss')

As I mentioned, this changed overnight and is an undocumented requirement. Before this issue appeared, timestamps were allowed in file names (e.g., #:#). As of now, in my testing A:# and #:A both work, but #:# does not work.

Esri is unsure if this is intended behaviour or not. I requested that they update the documentation for this connector. IMO, best practice is to name your files as per Windows' Naming Files, Paths, and Namespaces.

All comments

abureaux

Okay, this is officially closed.

abureaux

From the simplified test I set-up. All I am doing is getting a file, and then trying to upload it.

Again, I can manually upload a file to this same FL. And in this same flow, I can even Query Attachment and Delete Attachment successfully:

It really is just "Add Attachment" that isn't working:

Akshay Harshe

@abureaux That is weird, Can you share a screenshot of your Add attachment inputs. I am curious because, your delete attachment is working.

It could still be uploading/ creating a file that is somehow blocked.

abureaux

We upgraded from 11.3 > 11.5 over a month ago. That is the only real change. There is a chance this particular flow, which is the only one using Add Attachment, hasn't run since 11.3. I forwarded the port diagram off to my IT for them to check.

Beyond that, server should be unchanged.

Same connector version as yours:

{
    "statusCode": 400,
    "headers": {
        "ETag": "W/\"xyz\"",
        "arcgis_connector_version": "Enterprise 2025.2.0 2025.06.10 1749573699153 361de8",
        "X-Powered-By": "Express",
        "x-ms-environment-id": "default-xyz",
        "x-ms-tenant-id": "xyz",
        "x-ms-dlp-re": "-|-",
        "x-ms-dlp-gu": "-|-",
        "x-ms-dlp-ef": "-|-/-|-|-",
        "x-ms-mip-sl": "-|-|-|-",
        "Timing-Allow-Origin": "*",
        "x-ms-apihub-cached-response": "true",
        "x-ms-apihub-obo": "false",
        "Date": "Tue, 04 Nov 2025 21:41:23 GMT",
        "Content-Length": "91",
        "Content-Type": "application/json"
    },
    "body": {
        "success": false,
        "message": "AxiosError: Request failed with status code 500. "
    }
}

Akshay Harshe

I don't have many ideas since you are saying that it was working previously. Has something changed on your Enterprise Security wise? Seems like Power Automate doesn't have access to your Enterprise or the feature layer. See if all the necessary ports for webhooks are open if you are using them:

ArcGIS Enterprise ports

Also, In the Raw outputs of the `Add Attachments` action what version do you see under

"arcgis_connector_version": "Enterprise 2025.2.0 2025.06.10 1749573699153 361de8",

abureaux

@AkshayHarshe any ideas? I have opened a case today for this as the issue is ongoing and quite an issue.

Case number: 04039745

abureaux

I will also add that this flow watches an inbox for lab results. Because this project only allows 1 set of lab results per year, I filter the record for attachments, and then delete all attachments from the current year. This is working properly. So it is finding the correct record in the correct layer and modifying it.

Here it is successfully deleting the attachment I manually uploaded, just moments before failing to upload that same attachment itself:

abureaux

As mentioned, the 'Add attachment' step, but specifically for the Enterprise connector:

It's in a Do until to try until Success equals true

This is the extent of the explanation I get (raw json above), so not much to go off:

Akshay Harshe

@abureaux That is interesting. Can you please share what steps are you running and what connector you are using?

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