we need a patern to repeat, otherwise it's a lot of searching.
About 1st issue, that you cannot enter text, ussually it's because emails has a limited number of characters, so you can delete the previous email text, and try to type.
Hi, Paul.
Sounds like you're talking about REST API. And that your are overwriting data with older values if B managed to read record before A finished to update it. Classic conflict resolution ...