One thing you might want to check is the res for example some phones carnt read picture files over 1024 x 768 but some can so check the res on you picture first. Check to see what the maxium res your phone can handle

you want to cahnge the size MB is more than KB a 1000 Bytes is 1 KB a 1000 KB is 1 MB a 1000 MB is 1 GB (giga byte) and a 1000 GB is one TB (Tera Byte) and so on

Hope this helps or confuses you lol

Si