duplication of files on the smartphone

when I transfer a photo or video from the smartphonre card to owncloud everything is fine, the problem is when I want to see the same photo or video it saves the file in the phone’s memory, thus leaving 2 files.
I would like to know if you can’t open the file in the application without having to save it to the phone
thank you

what is the exact version of the app?

Versao 2.14.2
Sempre que quero ver uma foto, um vídeo ou pdf, ele grava o ficheiro no telemóvel na memória interna

Whenever I want to see a photo, video or pdf, it saves the file on the phone in the internal memory