Is there any limit for number of files uploaded? Do you have any inode limit?
You can have a maximum of 20,000 files uploaded on your account. Uploading a huge amount of files is decreasing overall server performance. 20,000 files is more than enough for any typical website (even the whole our website is using less than 200 files with all images included). However, with Premium plan you can have up to 200,000 inodes and with Business plan you can store up to 400,000 inodes on your account.