I cannot be able to upload 50MB software to server via FileZilla

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Well, seems like you’re getting into the file size limit, which is 10 MB for any file that isn’t a HTML, a PHP or a .htaccess file, and is also explained here:

Why are my files deleted after uploading them

Sometimes, when you upload a file, the upload is completed but the file is deleted immediately afterwards. This is usually caused by one of the following issues: The file is not in a htdocs folder All websites files must be uploaded to either the main htdocs folder, or to the domain specific htdocs folder (like example.com/htdocs). You cannot upload files to other directories on your account. If you try to create or upload files anywhere else, they will be deleted automatically. The file type…

If you want to upload a large website, you’ll be better off extracting the ZIP file to your computer (if that’s what you’re trying to upload) and then upload the extracted content inside your domain’s htdocs folder through your FTP client (which is FileZilla). This is also explained on this article:

How to upload big files / archives

InfinityFree has a file size limit of 10 MB on all servers. You cannot upload files larger than 10 MB. Installing large scripts A particular software package may be larger than 10 MB in size. Because of this limit, you cannot upload the archive directly and have it extracted on the server. However, you can easily upload the contents manually. To do so, you will first need a good FTP file manager for your desktop and setup an FTP connection. See the how to upload files with FTP article for more…