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There's no guarantee that all files will work as local files, but we'll make sure to help you out as much as possible.
First, it's a good idea to divide the tracks into different folders and then synchronise them. This is to check if there's only one file which is troublesome. Have a couple of tracks in each folder.
After that, make sure to connect both your devices to the same mobile hotspot.
Let us know how that goes, and send screenshots of any error messages you get.
All the best!