Pin naming export from UltraLibrarian to STM32CubeIDE project
Had the same issue, pins get lost when exporting with CubeIDE. I opened the exportet symbol file and they are not there, so it must be a CubeIDE or UltraLibrarian error.
However, the STM32 MCU I wanted to use is also in the standard KiCad Library "MCU_ST_STM32F1", so I just used this one. Although it is more time consuming, you can consider labeling the nets or adding comments according to the pin names of your CubeIDE project.
Edit: moved from the old thread Pin naming export (to have more chance for answer).
