a common issue is that theres no real indication that the audio has been import, the solution to that is to have enough frames for the audio to actually play, since the audio starts over when it gets to the end of the frames. tho if you have 645 frames, it should play just fine when you hit play. if its not tho, my best guess is that your audio metadata is weird? ive had issues with that in the past, so you could try opening your audio in audacity and clearing all the tags when you export it as a .ogg. thats my best guess though