Hello,is it possible to send data from usb via stm32F4 OTG FS to other MCU (arduino for example ) I tryed STM32_USB_Host_Library and it didn't work.

[QSDFG.1]

..

[Tesla DeLorean]

You'd need Host side code matching the Device side implementation. Beyond basic CDC or MSC implementation you're probably going to have to own that task or look at commercial stacks with richer options.​