What does the triangle beside sd card in open from list mean

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When sending a document by WhatsApp, we open browse other documents and after that we slide from right hand there the list comes written open from and down there is written picture, audio, video, SD card. Beside SD card there comes a small triangle and under that triangle there is a line. What does that mean? What’s the function of that button can anyone please tell.

Today 02:14 PM

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