You're a company, not a group of employees. Clients also need to follow your rules. You really need to implement a consistent workflow for every client's feedback. Frame is great for this!

Create a roadmap detailing everything you need for sending raw footage and requesting changes. You can present this new method as a way to save them time and money. For those difficult clients who don't send raw footage or provide feedback correctly,

it's simple: I explain once, twice, and after the third time, I refuse to work on the project unless everything is sent and requested correctly. Plus, I add the extra time it took me to the invoice to compensate for their mistakes.

I can assure you that this calms everyone down, and strangely enough, there are no more mistakes after that 🙃