Welcome @FlorentNapoleoni, to the community!
The STM32Wx designed for wireless communication are optimized for very low power consumption, an external memory would significantly increase this power consumption, which is rather counterproductive for battery-operated devices.
What type and size of external memory do you need and what is the specific reason for this? You can connect external memory e.g. via SPI, but accessing the data located there is significantly slower compared to internal memory for several reasons.
Regards
/Peter
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