PDF documents not displayed in lessons

[israelet]

Hi, I'm trying to get these PDF documents to open directly in my lessons every time a student accesses them, as was the case in previous versions. Currently, it always says it needs to be downloaded. This is a problem because mobile devices or tablets don't allow downloads unless their browser is in desktop or PC mode.
If anyone could tell me where I can fix this error, I'm attaching a photo of how the students see it.