When you receive a document and want to upload it to Proton Drive on Android using the "share" feature, it saves the file using the existing name, which is almost always meaningless when this is an invoice or anything else received by email. That would be great to be able to quickly rename the file before upload.

If we could also define a default prefix for files that would be even greater (e.g. date as "YYMMdd_" for companies wanting to comply to ISO 9001).