Hi Mahip,
I am also working on creating flavors for these transactions with Personas 2.0, and I am able to upload files within my transaction QM01's flavor, so my guess is you must be missing some OSS Note to fix that.
They have a cumulative note, here, see if that helps:
1964257 - Cumulative patch release for the SAP Screen Personas Release 1.0/ Release 2.0
Regards,
Gabriela
