Works or not depending on the App

[DavideRossi]

With some App Sharik does not work.
Specifically, the connection is established but as soon as the client issues the GET request to retrieve the file the connection gets closed.
This behavior appear to be App-dependant, for example Sharik does not work when executed from the sharing option of the Canon Print App whereas it works just fine when executed from the sharing option of the Samsung file manager.
Also notice that the very same App that causes Sharik to malfunction has no problem whatsoever on my older phone (newer: Samsung Galaxy S21 - Android 12, older: LG G7 - Android 9).
Could that be some weird permission problem?