Adjusting upload media size

[nebulade]

Writing to seek some clarification on the configuration variables.
When attempting to change the media upload size, there are various variables in the play:

• env file with MAX_PHOTO_SIZE with a default of 15Mb
• in the UI at /i/admin/settings -> Media there is a Max size value
• database table config_cache which seems to reflect the settings UI value
• cache php file, which seems to be generated with values only from the MAX_PHOTO_SIZE env varible value

For a start, it seems this setting could be changed by env var as well as UI or are those two different settings?
If env var is not set at all, it always falls back to 15mb regardless what the db table hase.
If env var is set, updating the cache php file will have that value.

I guess my confusion comes from the fact, that if I disable the cache file via ENABLE_CONFIG_CACHE=false in the env file, the whole Settings UI is disabled with a hint to enable the config cache, but at least for this upload size value, those don't seem to be connected?

Any clarification on how to properly configure this (ideally not through env variable but through the Settings UI) would be highly appreciated.

[jdaviescoates]

Just to add, I've also found that regardless of what all the above settings are, until you also make correspondingly increased values inside php.ini changing those values doesn't actually work.