Forgive me if this is a double post. I posted a "me too" in someone else's thread, so moderators, if someone answers that one, feel free to delete this one.
Here is a link to the file Black Welsh.psd - Google Drive
So try to place that file in an Adobe Muse page. If you manage to do it, tell me how you did it, because it's been driving me crazy trying to figure it out.
Those of you who will inevitably suggest workarounds, keep in mind, the image requires transparency, and there will be a LOT of them on one page, so file size could hurt download times.
Thanks everyone, and good luck. You'll need it.
Looks like there is some corruption in your attached .psd.
I copied the same content and a new file and saved which worked fine.
However, the compatibility mode setting can be found in Edit>Preferences >file handling.
That's a good start. This was created using data merge. Maybe I should've instead saved each manually?
I found the actual correct answer. Muse does not like files with data sets attached. I added the data set, it didn't work. I deleted the data set, it worked. The dataset was the cause of the corruption.