Here is how you can can duplicate many files to another account quickly without saving local copies:
- Create a free starter team and add both your accounts there as editors.
- Select all files you want to move to the new account (you can cmd + click/shift + click or drag the selection area around them to select multiple files quickly).
- Drag and drop them into the project in the new team that you created.
- Go to the second account, select all files in the project (Cmd/Ctrl + A).
- Right click the selection and choose “Duplicate X files”. They will be duplicated to the Drafts folder in the current account.