Common requirements.
WHAT WORDPRESS TYPICALLY NEEDS
A current PHP version Sufficient memory for your plugin set Adequate max input vars for menus and settings Common extensions for images and encoding
MEMORY
WordPress has its own setting in wp-config.php alongside the server limit.
The lower of the two applies.
MAX INPUT VARS
Raise it if menus or theme settings fail to save silently.
That is the most common WordPress-specific setting problem.
UPLOAD SIZE
The media library shows the effective maximum.
If it is lower than expected, check both PHP settings.
EXTENSIONS
Image processing is needed for thumbnail generation.
If uploaded images have no thumbnails, that may be why.
CHECKING
Tools, Site Health, Info shows the server configuration WordPress sees.
That page is the fastest way to see what is actually in effect.
WHAT SITE HEALTH FLAGS
Outdated PHP, missing extensions, and configuration problems.
Worth reading.
