CDNCruZerBuild, welcome to the forum.
Here is the Maintenance and Service Guide for the computer. On Page 143 you will find the information for the memory for your computer. In the Section titled DIMMS it states that the maximum memory is 16 GB when configured in dual channel mode.
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HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP Omen 880-160se; i7-8700K; 16 GB DDR4 2400; GTX 1070-8 GB; 512 GB SSD M.2; Win 10 Home
HP Spectre 360 Convertible; i7-7560U; 16 GB memory; Intel® Iris™ Plus Graphics 640; 512 GB PCIe® NVMe™ M.2 SSD; 13.3" diagonal 4K UHD UWVA eDP BrightView WLED-backlit multitouch-enabled edge-to-edge glass (3840 x 2160); Windows 10 Pro 64 with Windows Ink
HP Photosmart 7520 AIO
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I am not an HP employee.
The maximum memory you can install in the HP 6200 Pro is 32 GB (4 x 8 GB of PC3-10600).
See page 7 of the quickspecs...this statement...
The largest memory capacity possible is 32GB using four (4) 8GB DIMMs
I have the 8200 Elite CMT which is basically the same machine with a slightly higher Intel Series 6 chipset and the specs for mine stated the same thing and I am running 32 GB of memory in mine with no problems at all.