The limitation is with GMail I expect, most mail providers have a max attachment size.
On Windows (and Android, and probably Apple) there are batch programs to resize pictures. You can usually take them down by a large percentage without really noticing much degradation on, say, a phone screen. You could also try zipping them (I can't remember how on an Apple device) but I'm not sure that would work very well.
WhatsApp is neater as it resizes them itself, if it needs to. I recall attaching multiple pics to a single message.
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