Adding Attachement in ArcGIS pro

[RupaLNU]

Hello, 

I'm using ArcGIS Pro 2.7.0 Desktop for my work. I'm trying to attach files in feature class. I have used the Enable Attachment feature in Geoprocessing tools resulting which, the Attachments (0)  option is showing for the feature selected but the +Add is not working/can not be clicked. I have followed all steps from https://pro.arcgis.com/en/pro-app/latest/help/editing/edit-file-attachments.htm#GUID-DBB2786B-5674-4... but still this issue is happening. Could someone please help? Is there something wrong with my data?

Thanks 

[DanielMiranda2]

Is editing enabled on the layer you are trying to attach to? That's the first thing I would check.

[RupaLNU]

Yes, the layer seems to be editable.