Most providers actually reject messages with zipped attachments. And since you need a decompression software on the receiving end, I would not make it a proposed action. Unzipping something on a phone is not so easy. We might end up with limiting this to cloudFile, by naming the menu entry "Zip and send to cloudFile" and do all steps in one go(zip, replace messages, convert zip to cloudFile). I will discuss this with product management.
Bug 1856232 Comment 3 Edit History
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Most providers actually reject messages with zipped attachments. And since you need a decompression software on the receiving end, I would not make it a proposed action. Unzipping something on a phone is not so easy. We might end up with limiting this to cloudFile, by naming the menu entry "Zip and send to cloudFile" and do all steps in one go (zip, replace attachments in messages, convert zip to cloudFile). I will discuss this with product management.