I searched carefully and found that the youmicache folder should be the advertisement cache of Mi You player, which provided embedded advertisement cache space for Mi You software. Deleting will not affect your use, but this folder will still be created when you use the Mi You player, so if you don't want to see the youmicache folder on your sd card, the best way is to uninstall the Mi You player or use a lucky cracker to forcibly delete the advertisements in the software.

However, some netizens reported that Mi You player is not installed in their Android phones, and there will still be a youmicache folder. In fact, Mi You players use advertising alliance-style embedded advertisements. Although you may not have installed Mi You's products, if other programs implant advertising alliance's advertisements, you will still generate a youmicache folder in your SD card, so you need to be patient.