Disable deprecation log and TypoScript.strictSyntax check
Please disable deprecations at least for the production server, see https://blog.reelworx.at/detail/deprecation-log-handling-in-typo3-9/ and have a look at the errors in typo3_*.log. By scanning the log quickly I assume either setting TypoScript.strictSyntax to not complain about the old syntax or fixing the syntax to use only the new syntax a lot of lines can be avoided: https://docs.typo3.org/c/typo3/cms-core/master/en-us/Changelog/9.5/Deprecation-86068-OldConditionSyntax.html
Related to t3o/typo3.org#460
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information