Constant uploading errors. Less than half of uploads are successful compared with almost all successful with Box. There is never a useful error message to help find the problem. Also, it is slow to sync between phone and computer, and the computer app has problems that exacerbate this problem. PDF viewer also has broken search function. The arrow to go to the next result basically doesn't work, and the 'next' arrow is too close to the scroll bar so it scrolls to the start of document instead.