Offline Music Player funktioniert nicht

Have you saved tons of music videos on short video apps that you love?  Are you tired of poor music playback when your network connection is weak?  It supports playing almost every audio file format, while using only 3% of your device’s CPU and less than 80MB of memory during playback.  Do you enjoy listening to music on the subway, airplanes, or in the mountains?  No matter how long you listen, you’ll experience the best music moments! 2.  Our music player is even more powerful than Apple’s AVPlayer.  You can convert any format of video to lossless audio such as FLAC, WAV, AFLAC, etc. 6.  FLAC, WAV, DSD, M4A, CAF, ALAC, DTS, AIFF, AU, MP1, MP2, MP3, AAC, M4R, APE, OGG, OPUS, WMA, AIFC, M3U, BWF, 3G2, 3GA, 3GP, ADT, ANX, GXF, M4B, MKA, MKS, OMA, OPUS, RA, RBS, VOC, VRO, WEBM, WV, ZAB, MOD, A52...  Play music across your Mac, iPhone, iPad, Apple TV, speakers, and car using the built-in AirDrop feature. ● Please make sure the music you import is purchased through legitimate sources, as the app does not provide any online music content! ● Your Apple Account will be charged upon confirmation of purchase. ● If you choose auto-renewal, you can turn off automatic renewal at least 24 hours before the end of the current subscription period.