It's not usual, but if you need, here it's how you can clean your LocalStorage:

Press the right button of your mouse in any free area inside your Gmail.

On the open session, select on the top menu Console and on the type box on bottom type localStorage.clear() and press enter on your keyboard

Close the dialogue box, refresh your page, and choose account to login again.

That's is! Try Drag again and everything should be working fine.
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