Issue with Modification of scan

It always happens... I didn't even used it outside the app. Not even uploaded it to the cloud... By modification I wanted to add new pages... It worked fine for somedays... Not all the files happen to be the same. It's like more than 50 pages... I keep constantly add pages to the existing file. Does it have any maximum limit or what? This is the third time I'm facing this issue. Instead of just adding pages, I had to delete the entire file, and start scanning all the pages again for them to be in one file... Please help me with the issue...
