I know this is a big issue for a lot of guys who have uploaded a ton of stuff, and I can't help with that. However, in the meantime, if you want to use a FREE hosting site with NO account needed. Check out
postimages.org. It's super easy once you figure out the clicky-clicks. Here's a quick rundown...
Once you hit the site, click on the Choose Images box. You will either be able to upload a pic from your photo album on your phone/computer, or you can just snap a pic like I did of the knife in my pocket for this example.
After you do that, just left click the blue "Direct Link" button. No need to highlight/copy/paste or whatever. Just left click and it auto-copies.
Go to the little Image Icon next to the link icon ash shown and left click it to open the box.
Right click in the box to bring up the options menu.
Hover over "Paste" and left click to copy it in the box.
Left click the "Insert" button.
Boom... pic is posted with a permanent link that will not eat up Spark's space.
None of the Post Image nonsense will be around your pic. These were just screenshots i took off my phone.
Edit to add: There are faster ways to do this, but I tried to tease out the steps to make it easier for the less keyboard inclined