Another conversational tool, Claude by Anthropic. Claude has a simple, easy-to-use interface, and is considered by many to be close in quality to premium ChatGPT.
To begin, go to claude.ai from a web browser. Enter an email address, then check your email for a confirmation link or login code, which you'll use to complete your account activation.
Claude's conversation dashboard includes the option to add PDFs, docs, spreadsheets, and more to summarize, analyze, and query content.