HTML code chanes after upload

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Try to upload the file you’re trying to upload using an FTP client; here’s a guide to configure FileZilla:

How to upload files with FTP

The best and most reliable way to upload files is to use FTP. To upload files with FTP, you will need to following: Your FTP username Your FTP password The FTP hostname An FTP client You can find your FTP username, password and hostname in the client area under the FTP Details section. The FTP password is the same as your hosting account and control panel password, which is different from the password for the client area. If you like videos better then text guides, you can find one at the bot…

If it still doesn’t work, take note of the file size limits which are explained there:

@Admin

The file exceeds the file size limit

The InfinityFree web servers have size limits for all files. If the file size exceeds the limit, the file is automatically deleted.

The size limits are:

• HTML, PHP and JS files are limited to 1 MB.
• .htaccess files are limited to 10 kB.
• All other files are limited to 10 MB.

Please note that this is a file size limit, not just a PHP upload limit. All files on your account are subject to this limit, regardless of how you’re trying to get this file on your account.