Files named link.xml are used to prevent certain codes being "bytecode stripped with IL2CPP" (https://docs.unity3d.com/Manual/IL2CPP-BytecodeStripping.html).
I have two 3rd party SDKs in my Unity project, both have a link.xml file in their own folder. I worry if they conflict with each other? Should I combine their contents together into one single link.xml file?
Multiple link.xml files will work correctly. Unity will preserve the all of the types and methods in all of the link.xml files in the project.