This was just a quick fix, but I agree with you on the e2e messaging service. However, I do wish more e2e services like Telegram would open source their backend. Looks like Signal does now at least!
I imagine it is quite easy to reassemble a broken link with some extra whitespace or random characters (unless you really scramble it which makes the process of manually "decoding" tedious). At that point you might as well automate the process and use base64
