I have a file with one file upload connected to each record. Is there a way to detect if a file are uploaded or not?

Utaraptor--

The file should be displayed in the Web Viewer if the file was uploaded. Or, you could check using the SuperContainer Companion plug-in function, SCGetInfo( folderPath ) and if it returns a non-null value, that means a file exists in that folder path location. Alternatively, as the server administrator, you could physically look on the server machine on which SuperContainer server is running, and check whether a file exists in the folder path.

I hope this helps. If you have any additional questions or need clarification, do not hesitate to get in contact with me.

Regards,