Hi there and welcome to the forum! Please note that this is an English community forum, and so you must speak in English, or at least provide a machine translation of the content. Since you didn’t do all of those I translated the title of the topic and also some content of the message for you:
If there are so much files inside of your htdocs folder, maybe consider to use a FTP client to download the htdocs folder to the desktop, then upload the contents of the htdocs folder to the other domain’s htdocs folder. If the file you’re trying to upload exceeds 10 MBs then you need to either split it in some parts, extract the archive and upload the extracted files, or if you’re offering file downloads, consider sharing them on cloud file hosting services like Google Drive or Dropbox and link them back.