Encrypted file collaboration under ISO 27001, how do you make it work?

We’re trying to get ISO 27001 in place, and honestly, encrypted file collaboration has been a bit of a headache. We want to keep things secure, but also need to make sure we can collaborate easily without many roadblocks. Does anyone have tips on balancing both?

I would love to hear how you’ve made this work or what tools you’re using to keep everything secure but still efficient.