No cache file creation on subfolder installation

[Zodiac1978]

Running Cachify 2.4.0 and WP 6.6.2, but my cache folder is completely empty.

Not sure why this happens. My installation is in a subfolder (folder permissions was 750, but modifying to 755 does not help).

No error in the error log.

[stklcode]

So you have selected the "HDD" backend, <subdir>/wp-content/cache/cachify exists, but is empty?

My installation is in a subfolder

/path/to/page is internally redirected to /<subdir>/index.php or transparent, i.e. /<subdir>/path/to/page is called directly?

folder permissions was 750, but modifying to 755 does not help

I would not expect a world-readable to make any difference on the cache-generation side. Cachify (i.e. the PHP process) should be able to write. But we would also expect some kind of error message in case of permission problems.

[Zodiac1978]

Now it is not empty anymore, but it was triggered at 14 h, although I tried in the morning to trigger the cache creation with a non-logged-in view of the site.

Maybe because of my usage of APCu?

/path/to/page is internally redirected to //index.php or transparent, i.e. //path/to/page is called directly?

WordPress is https://example.com/wp and Site URL is https://example.com

In the root folder there is an index.php loading WP in this way:
require('./wp/wp-blog-header.php');