I am unable to open attachments in ArcPro for feature classes that have attachments or for hosted feature layers that have attachments.
I can open the map in AGOL or the hosted feature layer in AGOL and see the attachments. No issue opening the same attachments on a different computer.
Any chance you are clicking on either a feature with more than one attachement, OR, close enough that you are clicking more than one feature with attachments?
Pro 2.9.4 and later have a bug with HFLs where you are not able to do the above. It will only allow you to click on a single feature with a single attachment, or it throws error.
If you select the feature(s), are you able to see/access the attachments in the attributes pane?
R_
I am experiencing the same behavior with Pro 3.2.1 with feature class in our SQL Server enterprise geodatabase . I hope that this is fixed in the latest version!
We are seeing this same bug on our end with a file GDB on our local network. In Pro 3.2.2 my coworker cannot view the attachments in the 'Attributes' window. They appear to be there but he gets a "Failed to open attachment" error message when trying to view them. The attachments do show up in the feature popups,though. for me - the attachments show up fine in pop-ups and through the 'Attributes' window. I'm using 3.1.0