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If you are asking about CKFinder, see the Developer's Guide Built-in Resource Types articles, like this one for PHP.
Documentation Manager, CKSource
See CKEditor 5 docs, CKEditor 4 docs, CKEditor 3 docs, CKFinder 3 docs, CKFinder 2 docs for help. Visit the new CKEditor SDK for samples showcasing editor features to try out and download!
Re: changing the max upload file size??
If you are asking about CKFinder, see the Developer's Guide Built-in Resource Types articles, like this one for PHP.
Documentation Manager, CKSource
See CKEditor 5 docs, CKEditor 4 docs, CKEditor 3 docs, CKFinder 3 docs, CKFinder 2 docs for help.
Visit the new CKEditor SDK for samples showcasing editor features to try out and download!