Cannot upload attachments to feature service

[HanliePetoors]

Hi,

I'm working in ArcGIS Enterprise 10.8.1.

I have published a feature service with attachments from ArcMap. Attachments can be added in ArcMap.

However I can't add attachments to the feature service - I get this error:

The ArcGIS server error log shows:

I have restarted the service and republished it but it makes no difference.

Does anyone have ideas for fixing this problem?

Thanks

Hanlie

[HanliePetoors · Accepted solution]

In case this helps anybody in future, restarting the ArcGIS Server Windows service resolved this issue.