If you have large video files you wish to save with your students, the best way to post it to your blog is to take advantage of YouTube. Here are some instructions.

First, after you have uploaded your video to YouTube (you need a YouTube or Google account to do this), copy the URL (website address) of the video.

Next, follow the instructions on this page to compose a blog article. Then, click the film strip icon to the right of the smiley face in the WYSIWYG editor.

A popup window will appear. Paste the URL of your YouTube video into the box labeled "File/URL". Then click "Insert". Your video should appear in the blog article. 

Initially, the video will look like a big yellow box in the editor window; this is normal. The video will appear in the final blog post.