welcome on mnuto
for your questions just read the text.
1- you want add photo to your profile that is possible but your photo must be small not to big.
2-you want add music to your profile that is possible , first you upload the file then admin will approve your music
3-you can watch video how long you want from link youtube , just click on the link and click on search than you can watch video or add to your favourite
Any more questions you can chat with admin on chat
Name Dhr .alex