How to open docx, pdf, ppt without download first?

I can’t open docx, pdf or ppt with preview in nextcloud apps

TL;DR Depending on your setup, you can’t. To open the office documents (except for pdfs) you need to have a Nextcloud server setup including collabora or onlyoffice

In server nextcloud already install onlyoffice, but why time open file in android apps must download file first?

If you open a file on the Android client as in “on the device” you need to have it downloaded first. For OnlyOffice and Collabora the 3-dot menu should show an item open with/in collabora/onlyoffice which should do the trick for you

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