My document is stuck on 'uploading'

If your document is stuck in the "Uploading" stage, the connection was interrupted, or the tab was closed or navigated away from, before the file was fully received by the system.

How to fix this

Delete the stuck file from your Knowledge Base and upload it again. Keep the tab open until the upload finishes, because the page is what completes it.

Uploading is not the same as processing

Once a file has been received it moves into processing, where large PDFs are read page by page and audio is transcribed. That stage can take far longer than the upload, and a file in it is progressing normally, so check the Jobs page in the matter sidebar before you delete anything.