Adobe scan android app crash when file is larger in size

When scan file in adobe scan android have more then 200 pages a d when we tried to Dd more pages by clicking modify scan ,when we completed the adding pages to this previous file and try to save the pdf ot keep on loading and saving but after 15 minutes it crashes automatically and start again with the modify task where we had added the pages. So newly added pages are not lost but the task continue in this cycle again u press save pdf and after few min agin it will crash. So i am using this since 2 years but this problem persist since 2 years of my usage. It only happen in bigger file where no of pages crosses 200 but if u make the new pdf file with new scan them it want crash all thing will run and. Saved smoothly. This is very much annoying and time wasting. Other thing which that must have feature is when we tried to add newly scan pages there should be an option provide whether this pages to be added in start of the pdf and enf of the odf file so that we dont need reorder in case where we need to Maintain the newly added page at the starting of the pdf and so that datewise can be arranged earlier page at the last .