Hello,
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Based on the information from the OpenAI community forum, it is recommended to use .txt files with markdown formatting for your knowledge files. It was noted that .md files were not supported by the automatic retrieval, but .txt files with markdown formatting work fine[^1^]. Another user also suggested converting PDF contents into .txt files for better understanding by the GPT[^4^].
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The GPT does not necessarily prefer one file over another based on their order. However, one user suggested that if you are serious about optimizing your knowledge files, you might want to think about sorting your knowledge files and putting often required info at the beginning. This can impact retrieval time for large files[^1^].
In terms of referencing the knowledge files, GPTs will avoid revealing the names of uploaded files by default. If you want GPTs to “cite their sources,” you need to indicate that in the Instructions[^3^].
Please note that these are suggestions based on user experiences and may not always apply in every situation.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: