To move files from Google Drive to iCloud on your iPhone, you can follow these steps:
1. Open the Google Drive app on your iPhone.
2. Select the file you want to move.
3. Tap the Share button and then choose Copy to iCloud.
4. Enter your Apple ID credentials if prompted.
5. Your file will then be moved to iCloud.
If you want to make sure that your files are backed up to iCloud, you can also enable automatic backups in the iCloud settings of your device. This will ensure that your files are backed up regularly to iCloud, so you don’t have to manually transfer them every time.