Having never done this, I don't know if this would work. Select the file (you may have to move it to the desktop so that you are in Finder) and in the File menu, select Compress. Perhaps that will make it small enough to send. Worth a try...
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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