I got my free version of Bedrock Edition after checking my Mojang profile. Having done so, I selected a custom skin for my player character from my files via "Choose New Skin." Having chosen one I didn't want, I went to choose another through "Choose New Skin." While I chose a different png, the "choose the correct model type for your skin" window and resulting skin preview on the right side of the skin menu as well as in-game skin remain as the first skin I had chosen. I can't switch what "custom skin" I use. I can switch to "Steve" or "Alex," but cannot use a different custom skin.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-37926.
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Sorry, I wasn't sure what wording would get me the corresponding ticket. Looks like this guy was one step ahead with how to address it. Thanks, this is it.

Sorry, I wasn't sure what wording would get me the corresponding ticket. Looks like this guy was one step ahead with how to address it. Thanks, this is it.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-37926.
Please add a vote and any new information to the main ticket, which will be updated accordingly.
If you have not, you might like to make use of the search feature before making a new ticket, as it's likely that the issue has been reported already.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Feedback – 📖 Game Wiki