Currently the crawler is only supported for HTML and PDFs documents[1]. If you want to crawl markdown files, the crawler would need to be pointed to a location where these files are converted to HTML.
Links
[1]: https://www.algolia.com/doc/tools/crawler/getting-started/overview#why-you-should-use-the-crawler
The free DocSearch plan, doesn't include technical web support from the Support team. For further assistance, you can post your question on the Algolia Community Forum or Discord. For front-end issues, you can raise the issue directly on GitHub. In addition, you can review our DocSearch Documentation and FAQ.