The Fujifilm X-T30 includes a USB-C port, which is used for charging and can also be used for monitoring audio when recording video. To use standard earphones with a 3.5mm audio plug, you need an adapter. However, not all USB-C to 3.5mm audio adapters are the same, and so not all will work on the X-T30 for monitoring audio.
The X-T30 uses USB-C passive audio mode to output an analog audio signal through the USB-C port, so adapters that include a DAC (Digital to Analog Converter) will not work. Unfortunately, this includes the majority of currently available adapters . Adapters that are known not to work with the X-T30 include Apple’s USB-C to 3.5mm adapter and the Google USB-C to 3.5mm audio adapter.
Adapters that are known to work
The following USB-C to 3.5mm adapters don’t include a DAC and have been tested to work on the Fujifilm X-T30
Other adapters may also work. If an adapter specifically states that it isn’t compatible with the Google Pixel or iPad Pro, then it will probably work with the X-T30 since those devices output digital audio signals and require an adapter with a DAC. If it says that it works on the iPad Pro, it won’t work with the X-T30 so avoid it.