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 how can i use a pdf as a source material when it comes to chatgpt, and other similar apps 
 Have you played with perplexity.ai? 
 hmm never heard 
 OpenAI, Claude, etc all have file attachment icons. You can interrogate files after they’re uploaded. 
 oh, yet to try out claude

does the file attachment feature usually tend to require a subscription? 
 Yes 
 With openAI^ 

Claude is fine without but the quality of the summaries is exponentially better on premium