The checkout feature prevents multiple contributors from editing a file at once. Admin or read+write permissions are required to check out files.
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Check out a file
Open your project, then find the Files section.
Select the space next to the tile of the file that you want to delete.
A toolbar will appear.
Click the checkout button on the tool bar.
A modal will appear.
Click the Check out file button.
The file will be checked out to you.
Check in a file
Click next to the file, then click the Check in file button in the toolbar.
The file will return to its default state, becoming editable by contributors with admin or read+write permissions.