Hi @pongbork
My belief is yes, you could setup an HTTP(s) Flow, that waits for and consumes WebHook events from LINE. Looking at their docs their webhook does let you download the videos and images people post into the channel.
Below is how you consume those events and then you can call their Get Content API. According to Step 2, I see no reason it wouldn't work. But without setting it myself, I cannot guarantee.

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Cheers
Thank You
Michael Gernaey MCT | MCSE | MCP | Self-Contractor| Ex-Microsoft
https://gernaeysoftware.com
LinkedIn: https://www.linkedin.com/in/michaelgernaey