... you mean URL-length ... ?
... use in your /templates/<your_template>/member_uploadform.html ...
... instead of ...
<input type="text" name="remote_media_file" size="30" value="{remote_file}" class="input" />
... e.g. this ...
<input type="text" name="remote_media_file" size="30" value="{remote_file}" class="input" maxlength="50" />