Thanks for the support.
I have confirmed that the iCloud Drive folder works as is.
As for the file provider, I have not been able to confirm due to my lack of knowledge.
Also, Google Drive, One Drive, and Dropbox continue to not allow me to select a folder.
The OS used for testing is iOS 18.0.
Lamina
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I need ideas to make it work with Google Drive, One Drive and Dropbox as well.