Cannot add Google Drive in Files
I don’t have Edit option when tap on More buttoon iin filess app.
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Based on your screenshot, you're one screen too far.
You tapped OnMy iPhone.
You have to follow all the steps and instructions in Related Article: Use third-party cloud apps in the Files app and if you still need help, get more help and assistant from Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK)