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Hello,
First, you should create a new post to describe a new problem.
Secondly, in this folder /xoops/class/ there is a file called uploader.php.
Read its comments.
Now, if you want an example of the usage of the XoopsMediaUploader class, I recommend you to see some examples from running modules like News of Birthday :
https://xoops.org/modules/news/article.php?storyid=4330
Bye,
Hervé