### What?
Previously, while uploading a file - if the uploading process took a bit
of time, users could still save the document prior to the upload fully
completing.
### Why?
During the uploading process - the save button should be disabled until
the upload is complete to prevent premature saving of an upload
document.
### How?
Now, we keep track of the state of the upload in a provider and disable
the save button until the file is fully uploaded.
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