@Dwayne *******
If you’re on any kind of visa that requires monthly transfers to your Thai bank account, they absolutely do care. Your qualifying transfers must be foreign sourced.
For other visas, such as the LTR visa, There’s no need to show monthly transfers.
And mixing & matching is certainly fine, providing the foreign sourced portion of your income meets the required amount (e.g., 40k baht or 65k baht).