I need help setting up the .htaccess for my DigitalOcean App Static Website

I created my static website with the new service called Apps, and I tried to add my .htaccess file, so the file gets uploaded and can be accessed by url through URL example.com/.htaccess but is not working on Digital Ocean and it’s not being executed.

I wonder what is the problem?

The .httaccess contains this:

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://%1/$1 [R=301,L]
ErrorDocument 404 https://mysite.com
ErrorDocument 500 https://mysite.com
RewriteCond %{HTTPS} !on 
RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$ 
RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$ 
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
RewriteCond %{THE_REQUEST} /([^.]+)\.html [NC]
RewriteRule ^ /%1 [NC,L,R]
RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule ^ %{REQUEST_URI}.html [NC,L]