RAM replacement

Could you please help me with information regarding the options available for RAM replacement?
Specifically, I would like to know about the compatibility of the new RAM modules with our existing hardware (UR3):

1. What is the maximum RAM capacity supported by the motherboard? Is it specified anywhere in the documentation?
2. Are there any known issues that may arise when changing the RAM?
3. Do you have information about specific compatible RAM for this motherboard: frequency, capacity oy type?

We are interested in procuring high-quality RAM modules that would best suit our needs. Therefore, any technical specifications would be greatly appreciated. Maybe you have already done this before, I mention that the current memory is 2GB 1Rx8 DDR3L 1600 SO