Canon EOS RP Instruction Manual page 382

HDR (High Dynamic Range) Shooting
RAW HDR images are captured in JPEG 73 image quality. RAW+JPEG HDR
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images are captured in the specified JPEG image quality.
HDR shooting is not possible with expanded ISO speeds (L, H1, H2). HDR
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shooting is possible within ISO 100–40000 (varies depending on the settings
of [Minimum] and [Maximum] for [ISO speed range]).
The flash will not fire during HDR shooting.
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AEB is not available.
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If you shoot a moving subject, the moving subject may leave afterimages.
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In HDR shooting, three images are captured with different shutter speeds set
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automatically. For this reason, even in < t >, < s >, and < a > modes, the
shutter speed will change, relative to your specified speed.
To prevent camera shake, a high ISO speed may be set.
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