Lines covered on illustrator when saving

I wonder if anyone can help! I'm using illustrator in the ipad and did a drawing however when I save it, it has a black background and only shows certain lines, I'm not sure what to do or why it's done it and it's my first time using it on the ipad. To merge all the lines I intersected it so it can move all at once. Unsure how to save with all the lines on show and be able to use it on photoshop or Procreate afterwards.