Directories for temporary files are documented on this mPDF Manual <https://mpdf.github.io/installation-setup/folders-for-temporary-files.html>. Note that this library is not a Google product and we therefore can not support it due to our limited visibility. It is recommended to continue technical support for this tool on Stack Overflow <https://stackoverflow.com/questions/tagged/mpdf> and/or on their official support forum <https://github.com/mpdf/mpdf/blob/development/.github/CONTRIBUTING.md>. After a quick courtesy search I was able to discover this similar StackOverflow thread <https://stackoverflow.com/questions/48554488/mpdf-temporary-file-is-not-writable-using-yii> that offers multiple insights about a possible solution.
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