Okay, I think I solved it. The menuconfig answer helped point me in the right direction.

Steps/notes for future users who are stumbling across this problem with PlatformIO, using the Arduino framework

(1) If you get stuck: try the Arduino IDE and make sure SPIRAM is working on your board. This is ...

Hi,

I'm having a heck of a time trying to figure out how to allocate SPI RAM memory with the Lolin D32 Pro v2. I can't figure out how to get SPI RAM accessed at all.

Board specs are here:
https://docs.wemos.cc/en/latest/d32/d32_pro.html

The PSRAM should actually be listed at 8mb (https://www ...