I need to be able to search my AdobeStock portfolio by keyword or tag in order to update keywords and tags. Can this be done?
Search can't be done for specific portfolios - I expect each contributors login to https://contributor.stock.adobe.com/ and do what needs to be done there - i.e. update uploaded assets, etc
You can search while visiting your portfolio through the customer facing site, then copy the file number and paste it into the dashboard section to pull the file up and make necessary changes to indexing. As mentioned by Joon.Stock, you can't search using keywords from within the dashboard section yet.