@kiwifergus said it well. On iNat, the media evidence is primarily there to help others evaluate the observation and make an ID (although documenting behavior is also important, of course), so it shouldn’t be bigger than is necessary for that. We don’t support uploads of over 20mb, and we resize large photos to a maximum size of 2048 x 2048 pixels.
@jamesray would a few seconds of the calls be enough for others to evaluate when making an ID?