10/21 - Update:
I would like to reiterate my request to please add audio file format requirements and the step of marking assets “Public” to the UEFN Docs. Just today I saw another Forum post by a creator @JallsoppPL asking about this. I’m sure others have been asking each other outside of the Forums too. Normal - MP3 files do not show in the Content Drawer
9/9 - Original post:
Here are a couple of hangups I ran into when importing audio files to UEFN and trying to use them in gameplay. I found fixes but I would love it if the sound format requirements could be listed somewhere so creators don’t have to troubleshoot as much as I did. This seems like a good place for it: Criteria for Importing Assets in UEFN (Docs) Maybe these tips are already listed somewhere in the docs? But I couldn’t find them.
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MP3 files do not show up in the Content Browser. When I try to import the file there is no error message in UEFN telling me that MP3 is not supported, and that I should use OGG or WAV instead. I switched sound formats based on a tip I saw in the UEFN Discord and it worked.
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In order for the sound to play in gameplay, the asset must be marked “Public” in the Content Browser. Again, this is an answer I found in the UEFN Discord, but not until after I spent a long time troubleshooting many other fixes like importing WAV instead of OGG, trying different SFX download websites, testing different devices and device settings to trigger sound etc. Once I found out I needed to use Public, it was such an easy fix! (Right click on asset in Content Browser, check Public Asset under Asset State.)
Hope this post is helpful to others who run into the same problem. 
