Ah I see,
Listen, historically wav files are just raw uncompressed audio with no standardized tag support unlike lossless audio formats like FLAC, APE and ALAC that feature audio compression without any loss in audio quality and standardized tagging specifications. Still, there's some padding at the beginning and end of a wav file for data, which means potential metadata storage for tags. MB and several other players have taken advantage of this to support some degree of tagging in wav files. However, no standardized tagging specification for wav files leads to compatibility problems. As a result, I am not surprised that your audio player of choice on your phone doesn't support tags in wav audio. My advice to you is to convert your wav files to FLAC that will 1) lower the size of your file since wav files are uncompressed raw audio and 2) use a tagging specification supported by most (if not all) audio players for your phone.