Help With File Upload in IOS

HI, I use a project APK in Android and I access the user Library Photos , files videos . I chose one file and then upload it to a REST . The problem is with IOS . When use IPA in IOS 9 or 10 system. It don’t allow me to select the video files. It show the files but when I press send it tell me the response from REST is 200 OK but the file was not uploaded and it show corrupt file. Looks seem like the access to read and get the file content failed … Anyone know how to fix this issue? Thanks.