Hello budlia63,
Yes, it is possible to embed YouTube or Google Video clips. Just click the image icon (the picture of the tree), then click the right-hand tab 'External site'. Then, copy and paste the web address of the page containing the video (not the 'embed' code - just the address of the page itself) into the URL field. Then, from the dropdown menu, choose either 'YouTube video' or 'Google video', then click 'Insert'. The video clip should then appear within your post, once uploaded (until you submit the post, you'll just see a yellow box, but the video will appear once your post is published).
And yes, you can also upload sequences of images. Just keep repeating the same image upload process you've been using, for each individual image you wish to include in a single post (I would recommend inserting a couple of line breaks between each image.)
Best,
Daniel