Yes this can be annoying. For any files you upload there can be problems if the file you add contains a filename with irregular characters in it.

Like spaces. %, ^ " etc etc.

e.g. myfile-£$£&&&... %%%%.jpg

In most cases just renaming the file to something simpler then re-adding will fix this. Let us know and we'll add a credit back to your account for the trouble. 

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