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Imgur is a free image hosting site. You don't have to sign up/register to use it.
Example: How to post your avi
Download the image by clicking on the "Download Outfit Image' tab
Save into a folder where you'll be able to find it easily
Go to imgur.com and click on 'New Post'
Click on 'Choose Photo/Video'
If it's a new image/file, click on the 'Quick Access' folder or whichever folder you saved it in. Find the Image/file you want to upload and double click on it to open.
Move your cursor to the top right corner of the image. You'll see a pop-up of 3 dots:
Click on it and a drop down menu will appear. Select 'Get Share Links':
Another drop down menu will appear. Click on the BBCode 'Copy Link' tab:
Then paste the link into the reply box. You might like to preview to make sure it has worked. Then click 'Submit' and you are done!