Well, assuming you mean uploading
pictures, here's a discussion about that -
You may need some kind of photo editing software to reduce the size of your pictures if you want to include them as attachments.
I use Snagit, but there are free photo editors available, such as this one -
An alternative is to use some external site (like Dropbox) to store the pictures and then post a link to them. However, high-resolution pictures sometimes are challenging for those with smaller screen resolutions or dial-up connections and may not offer anything that can't be seen in a low-resolution picture.
You should probably also read this -
Which says, in short, you can't copy someone else's pictures. But you can include a link