|Uploading a file
You can upload a file to the AO as an attachment to a new card.
Add a pyramid or grid to the card, if it doesn't have one.
Drag a file from your desktop and drop it on an empty grid square.
Wait until the file fully uploads, then it should re-download and appear on a new yellow card.
If the card is blue, something went wrong.
Files are stored by their hash, so if you upload the same file, it will match the existing card (after re-uploading). If an upload is breaking, change the file a tiny bit and then it will re-upload as a different card.