App search - pen input

I am looking for an app for iOS where I can edit files with the pen. These must and should then (automatically) end up in the NextCloud, or be synchronized.

  • I would like to edit files (PDF, JPG, or similar) with the pen.
  • Create notes, although I could also use a blank PDF here.

Can someone give me a tip? That would help me extremely.

Thanks a lot, Lars