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There are two ways to add files/attachments to a case: Drag-&-Drop or Manual Searching
Drag-&-Drop
Files can simply be dragDrag-&-dropped the file into the Files section of a Case
Click Done
Your file will now appear in the Files section of the Case
Manual Searching
Click on Add Files
Click on Upload Files
Search for the file you want to upload and click Open
Click Done
Your file will now appear in the Files section of the Case