When uploading to your digital vault the maximum size a file can be is 500 MB.  If an attempt is made to upload a file larger than 500 MB an error message will appear noting that it exceeds the file size limit. 

TIP: Try zipping the file to see if the file is condensed to a size smaller than 500 MB

The file upload is also based on the available storage in your digital vault.  If the size of the file being uploaded is larger than the available space an error message will appear noting that the account does not have enough free space.

TIP: if your digital vault doesn't have enough space consider permanently deleting files you no longer need or purchasing additional storage