I cannot provide server access. I will email the latest log (public/legacy/suitecrm.log) to info@helfertech.com on Thursday.
I confirm I tested MultiFilesUploadForSuite8MonthlyV2. Tests were run on a clean docker image from Bitnami with SuiteCRM 8.6.1, and on a custom instance installed per SuiteCRM docs.
Please provide concise, step-by-step instructions you use to install your module (Module Loader steps, any extra files, frontend build commands and directories, required package.json changes etc.).