Files successfully uploaded via FTP but cant be accessed trough browser

I have problems with accessing my php files uploaded successfully, but cant be accessed trough the browser. I see them uploaded on the htdocs folder but when i go to http://myhour.epizy.com/ajax/ address the directory listing shows only two out of four files. I dont know why this is happening. Are there reserved file names which are forbidden to be shown or something. Moreover i hadn’t set any directory privacy. I had the same problem when i tried to embed javascript file other files where loading perfectly fine but only one had the problem when i changed the file name it loaded well as the others. Here are some pictures to show the problem.
Image of the FTP client
https://imgur.com/4ZU68IT
And image of the browser
https://imgur.com/CFd2c1Q

Chat scripts are not allowed on our hosting, please remove those files from your website.

I didnt know it sorry for that! Thank you for your answer.