I wish I had an example I could show you but its been years since I had any problems with the layers. I remember awhile back I had problem with layers but I think that was with like version 6 of the program, which is when I started using the method I showed you. I tested it the way you mentioned and it seems to be safe so I would stick with what you have been doing. I will have to make an update tutorial on that subject or add a note into video.
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