I couldn't tell you how to set up Google Drive for file exchange (I sometimes use that, but I've never had to set it up)—I usually use DropBox, which is easy (enough) to set up (https://www.dropbox.com/basic to sign up for the free (2GB) version of DropBox).
But I'm not sure that method of exchange will work between Mac & iOS versions (which I guess are technically two different applications)..? Apple seems to want you to do it via iCloud:
https://support.apple.com/guide/garageband-ipad/share-songs-chs39284d66/ipados
And here's Apple's explanation (from the GarageBand Mac Help document):
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SHARE PROJECTS
Share a project to GarageBand for iOS
You can share a special GarageBand for iOS-compatible version of your GarageBand project to iCloud. The project appears in the My Songs browser of on your iOS device, as a new song with a single track containing a mix of the entire GarageBand project. You can add, edit, and arrange new tracks in GarageBand for iOS, then share the updated song back to iCloud. When you reopen the project in GarageBand, the new tracks are added to the original project. If the reopened song contains a Remix FX track, the Remix FX appears as automation on the Master track.
In the GarageBand for iOS app, you can also share the project as a ringtone to your iOS device. For more information, refer to GarageBand Help on your iOS device.
Note: Sharing a project to GarageBand for iOS requires an active Internet connection and iCloud login.
Share a project to GarageBand for iOS
1. Choose Share > Project to GarageBand for iOS.
2. In the Export to GarageBand for iOS dialog Save As field, GarageBand defaults to naming your shared GarageBand project with the same name as your GarageBand project. If you wish to change the name, type the new name [ in the Save As field].
WARNING: If you change the folder from GarageBand for iOS—iCloud, your shared project won’t appear in the GarageBand for iOS My Songs browser.
3. Click Save.
To return to GarageBand without sharing the song, click Cancel.
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I don't have an iOS device, so I can't test it out, but this video (I've linked the course above) also discusses it, to some degree—maybe there's something in there that'll help..
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