Files temp-folder

Hi, I have clipbucket ver 2.8.1 installed, pictures are uploaded OK but not videos (I tried MP4 and avi). They seem to be stored/converted in files-temp folder with extensions such as .abc with size same as uploaded file. Log regarding conversion seems OK but on the UI where there is still a conversion pending indication. Any ideas? What is the purpose of the temp-folder? If result of conversion is stored in temp what is the mechanism for moving a file from temp to videos folder? Thank you!