Great question and thanks for addressing this! In terms of presentations, only ppt, pptx, and odp, while concerning text documents, only doc, docx, odt, and rtf are supported, I'm afraid.
As a workaround for Keynote, you may just simply Export the presentation in Powerpoint format by clicking on File > Export to > Powerpoint... After this, you may just drag the exported .pptx file into Miro.
Concerning Pages, you can export the given file in Word format by clicking on File > Export to > Word... Once you have the .docx file, you may just drag that also into Miro.
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