K8y Just checking to see what people use to play videos sent via email attachments...
The GrapheneOS community includes people from around the world, with a variety of work and sleep schedules. A question should in general not be viewed as unanswered for at least a full 24 hours after posting.
If that much time goes by, it may make sense to think about adding more information to the question, such as which app(s) are in use, which device type, which GrapheneOS build number, which cellular carrier is in use, etc. This will typically be more productive than re-asking the same question, "bumping" the thread, etc.