If you do not have access to php.ini, there is no way to change the upload limit. The upload limit is set from your main server.
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If you do not have access to php.ini, there is no way to change the upload limit. The upload limit is set from your main server.
If it only shoes the first few minutes, the limit is probably less than 100MB. As I said before, the text "100mb" that you see is just text. It doesn't mean anything to PHP.
Now, with regards to the file not being rejected, that is possible because the upload script, by default, has a different upload max. For the file to be rejected, you would need to change the max file limit in the upload script to match what your server is actually set to. Then, the uploaded would reject the upload if it is too big.
You can change the the text (100 mb) by editing the upload_file.tpl in template folder