hi contrastblack and SuggeElson
my file’s are uploading now he was right (SuggeElson) i was using html file’s in theme preview, the only question now ( i can only use the image’s used in html or html’s complete page image only?) for the theme preview and also tell me for the theme preview who will make html page’s in theme preview on the site.
thanks once again cheers 
You need to host demo in your server and provide only link
Demo has no limitation ( html, javascript, images and etc. )
Ivor said
Open a free Dropbox account, install, go to the Dropbox folder in My Documents (Windows) or ~/user/Dropbox (OS X) > paste your HTML folder in the “Public” folder, right click in index.html > Dropbox > Copy Public Link > http://ivor.bz/A6us done. https://dl.dropbox.com/u/780465/BootstrappedDocs/index.html
thanks SuggeElson .
I am having the same issue with this but none of the solutions described above have fixed the problem.
When I submit files for review, I receive the following error
“405 Not Allowed nginx”
Browsers tried (Mac) Firefox Chrome Safari
Does the preview Zip contain anything other than jpgs? No
Do the jpgs have any spaces in the files names? No
Have you tried FTP? Yes
File sizes Product: 20mb Preview: 40mb
Could somebody please contact me re. the issue.
UPDATED Reducing the Preview file size to approx 15mb worked for me.
Yes the preview have space limit 
