In response to some of the comments.
1. I've tried the copy and paste keyboard shortcuts - same thing. BTW...I just used the menu to show that I was in fact copying data for the video.
2. I understand about the rasterization copy vs image copy that is discussed by @GarryP. I've attached a new video in which I copy a pixel layer. Same behavior.
3. I'm going to update the NVIDIA Drivers now...I will post after with update.
Are you using Windows Clipboard History? NODo you have 'sync Clipboard across devices' enabled? NOAre you running any other clipboard management tools? NODo you have Hardware Acceleration enabled within Affinity? (Edit > Preferences > Performance) YES
Here are my Preferences (64GB RAM, i7-10700K, NVIDIA GeForce GTX 1650 SUPER):
9XixrrfaTz.mp4