Drupal 8.x

Language selection module 8.x.2.3. I have 2 languages enabled, each setup with it's own url /en & /fr. The detection and selection has the correct order

 URL > Cookie > Language Selection page > Selected Language

The standalone template has been set and the html--language-selection.html.twig page created from html.html.twig.

When I visit the site www.mysite.com/language-selection it immediately redirects to the front page mysite.com/en.

I am migrating a site from D7 to D8. I have several content types that allow for unlimited taxonomy terms. In D7 the terms are entered in one field separated by commas (ex: term1, term2, etc). 

In D8 it appears that one has to click "add another" each time an additional term is added. If I try adding multiple terms separated by commas they get entered as one terms. For example in D8 it appears that entering: term1, term2 becomes one term "term1, term2." 

I have set up a drupal site on an apache webserver on my localhost.

Navigating to any .module files, I am able to view them, e.g. localhost/core/modules/user/user.module

I am unable to view any .php files.

I can see in the .htaccess file there seems to be code to prevent .php files being viewable. Should there be something similar for .module files?

I´ve updated from Drupal 8.7 to 8.8.1, just entering "composer update", but still using drupal/core, not the drupal/core-recommended package. How to migrate to this new package?

Other thing, composer is warning:

I have set up private file system and it works fine until I set Default download method  to 'Private local files served by Drupal.'

Then I can't access any nodes and site throw error below. Any suggestions please???