The FUJIFILM XApp is the app that is for Fujifilm X/GFX Series camera users.
How to Setup and Use the New Fujifilm XApp Features
New Fujifilm X App Available Now for iOS and Android - Fuji Rumors
Fujifilm X-App für einfache Kamerabedienung - *fotowissen
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FUJIFILM XApp
FUJIFILM WPS Photo Transfer – Apps on Google Play
New XApp recognizes third party lenses : r/fujifilm