Posting pictures

I use a Samsung tablet running Android, if I can help Knotty give a shout. I'm no good with iPads though.

Hi JJB,

It keeps coming up that my pictures are too big?  Got no idea how to resize them, any suggestiins please?  I have the same tablet as you have.

Go into gallery, tap the picture, tap the 'pencil' icon at top right, tap the vertical three dots at top right (usually called 'more') and you should see 'resize' as an option. I usually resize to 40%, then save. The pic should be saved to gallery. Then chose this newly saved pic for your post.
Have a go and come back if I've missed something

PS I'm running Android 12.