How to compare files between Dropbox and Google Drive

[asdffdsa (jojothehumanmonkey)]

fwiw, use --vv --dry-run to see what rclone is doing, without actually copying any files.
for testing, rclone copy a single file and see what happens.

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here is a comment from @left1000

@left1000

If you supply the --download flag, it will download the data from both remotes and check them against each other on the fly. This can be useful for remotes that don't support hashes or if you really want to check all the data.

in your case, there is a third variation - rclone cannot compare different hash types.
dropbox uses DBHASH and gdrive uses MD5

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@greatestradioshow

--drive-server-side-across-config

can remove that flag.
only works when both, the source and the dest are gdrive.