Media replacement is not showing in the Properties panel when working with MOGRT files

Hi, I wanted to ask about something. I created my own MOGRT file in After Effects where I'd like to be able to replace media within the template. However, when I import it into Premiere, the option doesn't show up at all in the Properties panel (see photo). In After Effects, I tried dragging both a standalone PNG and a precomposition into the Essential Graphics panel — neither worked. Am I doing something wrong in After Effects, or is this a bug in Premiere? If I use a MOGRT file from someone else, it works fine — just mine doesn't. Thanks for any response.