The easiest upgrade is to swap out the HD for the Seagate SSHD drive or 2.5" SSD. Here's the IFIXIT guide: [guide|32815|Mac Mini Late 2014 Hard Drive Replacement].
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Your other option is to add the Apple blade SSD and keep the HD. This will require replacing the drive frame with one that has the blade SSD ribbon cable.
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Your other option is to add the Apple blade SSD and keep the HD. This will require either replacing the drive frame with one that has the blade SSD ribbon cable or install the ribbon cable [https://www.aliexpress.com/item/NEW-SSD-Hard-Drive-Flex-Cable-for-Apple-Mac-Mini-A1347-Late-2014-Year-Upgrade-Kit/32741383817.html?spm=2114.13010308.0.0.81ADA3|Blade SSD Flex Cable for Apple Mac Mini A1347 Late 2014] and then the correct SSD
The easiest upgrade is to swap out the HD for the Seagate SSHD drive or 2.5" SSD. Here's the IFIXIT guide: [guide|32815|Mac Mini Late 2014 Hard Drive Replacement].
Your other option is to add the Apple blade SSD and keep the HD. This will require replacing the drive frame with one that has the blade SSD ribbon cable.