Hi @CEEJ38, welcome to the forums.
There are two versions of the Zedboard board files, one from Avnet and one from Digilent. Please make sure you are using the Digilent version as the Avnet version does not include Pmod interfaces - installation instructions can be found here: https://digilent.com/reference/programmable-logic/guides/installing-vivado-and-vitis#install_digilent_s_board_files.
Alternatively, you can manually constrain your Pmod ports instead of relying on the board files. The "Add GPIO Peripherals to a Block Design" section of this guide discusses how to do this, in the context of some button inputs: https://digilent.com/reference/programmable-logic/guides/getting-started-with-ipi#add_gpio_peripherals_to_a_block_design. I would recommend this approach over the board files for this kind of I/O interface, as the board files and IP presets can obscure some important details of what is going on that are better to learn sooner rather than later (I/O constraints, configuring IP as necessary for the peripherals you're talking to, etc).
Thanks,
Arthur
CEEJ38 got a reaction from artvvb in Pmod AD1 input to generate an external PWM signal (combining C and Verilog code)
