Hi All, I have been working on a requirement where we need to add supporting documentation for a serial numbered item on the inventory detail tab > Inventory Numbers subtab and to one of the records there (in the popup window, screenshots attached). Presently it is not covered either File Drag and Drop, as well as no file addition is possible there. Is there another way of achieving this? Thanks in advance.

not sure if I got it right, but I think what you can do is to add on the record, a custom field of type "document". Basically, with such a field, you can upload and add a file(in the file cabinet) and basically this file remains referred in the record.