The inability to block ALL incoming file shares, or even have a whitelist, is detrimental. You WILL get spammed 20 to 30 times a day with "hey baby" and "sexy" spam. And don't expect a fix. It's been years, and it's till broken. Use another service like Onedrive. Blocking individual users one at a time isn't viable. There needs to be a whitelist option. "Block all except..." kind of thing. Developer responded with something that is not a solution to the problem at hand.