Why did my MP3 music disappear from iPhone and iPad after iOS upgrade?

I have had my own mp3 on my phone and iPad and even my iPod for years - after getting the new iPhone and iPad I copy them to new. I like playing my music have over 400 albums I have played for year. Rip over 4000 song to MP3’s after an after one of lateness all my music misappear Because you screw with iTunes You have made it a pain to download to my devices. I spent a least a day to find away to add them to iPad sync my iPhone. Today they all disappear again. Check iPhone there gone for there too. Right now I feel you ripped me off for months my music stayed. You upgrade iOS. Now I hate my apple devices. I connect them to all my google devices now I can play music. Old Apple Music I justed you said you would upgrade my music to higher never did all of them. With new device I got 3 month free of apple one only thing I liked was

that Apple TV music was pain in my *** off mini iPad then 2 new iPad plus my iPod you went to Xxxxx me and think I will stay buying apple devices. Do not think so after first mispairing I call your support was unable to fix it. I’m over 70 years old all my family. Living about 100 plus I will not push I

Apple devices. Your were good now you screw the people that made you great. Ty

[Re-Titled by Moderator]