Can you give us a few more details to assist with determining the issue? What version are you using? Does this happen on only one file or more? What are you doing with the layer just before this happens? When you close the app and reopen, does it work normally?
Hi so i have an ipad and its only this one file its the first file ive ever done on this. ill be drawing with the apple pen and then the preview will just turn black and wont fix no matter what i do then the app crashes even after restarting and turning off and on and everything