Hi @mbzar,
Welcome to Box Community, and we’re glad to help with your Box search queries.
The content within your files is also stored within the Box search index. The following file types support file content search: ‘boxnote’, 'csv', 'doc', 'docx', 'gdoc', 'gsheet', ‘gslide’, ‘gslides’, 'htm', 'html', 'msg', 'odp', 'odt', 'ods', 'pdf', 'ppt', 'pptx', 'rtf', 'tsv', 'wpd', 'xhtml', 'xls', 'xlsm', 'xlsx', 'xml', 'xsd', 'xsl', 'as', 'as3', 'asm', 'bat', 'c', 'cc', 'cmake', 'cpp', 'cs', 'css', 'cxx', 'diff', 'erb', 'groovy', 'h', 'haml', 'hh', 'java', 'js', ‘json’, 'less', ‘log’, 'm', 'make', ‘md’, 'ml', 'mm', 'php', 'pl', 'plist', 'properties', 'py', 'rb', ‘rst’, 'sass', 'scala', 'script', 'scm', 'sml', 'sql', 'sh', 'txt', 'vi', 'vim', 'webdoc', ’yaml’
If you can’t search using the file content, it could be because your file type doesn’t support content indexing.
To know more about search for files and folders, please see this article.
Hope it helps!