hello,
I have uploaded logo but i am unable to find it under webapps/
where uploaded logo is saved in xwiki?
thank you!
webapps/ is not really a data store in Java application server world, it’s usually readonly application stuff.
XWiki data are stored in the configured environment.permanentDirectory (xwiki.properties file) and if this is not configured you get a warning at startup telling you where it fallbacked (whatever is the application server temporary directory, which is quite dangerous as you can notice with the word “temporary” 
).
Anyway in the specific use case of the logo AFAIK it’s supposed to be an attachment so you can find it in the document where you attached it (I think it’s the color theme document).
thank you very much