Correction to the record, with a reproduction.

.ODT IS SUPPORTED. In the "Link with Proton Drive folder" picker, an .odt file appears normally with its type label. A .ods file in the same folder does not appear at all, and the picker reports "1 file is hidden (unsupported file type)".

So the gap is spreadsheets only: xls and xlsx are supported, ods is not. The supported-types list circulated by Support ("xls, xlsx, csv") is accurate; reports that neither odt nor ods work are incorrect for odt.

Request: add ods to the supported spreadsheet types. It is one entry in a format allowlist beside two formats that already work, and it unblocks anyone who authors in LibreOffice.

Secondary, lower priority: Lumo's Creations download offers PDF, Word and HTML but not odt/ods. LibreOffice users currently export through Word. Native odt/ods output would close the loop.

Separately: "Save to Drive → PDF" produces an image-based PDF with no selectable text, so it cannot be fed back into a knowledge base. A text-based PDF option would help regardless of ODF.

Support for Libre Office file types makes it easier for users to open and manage documents across different platforms. Likewise, a reliable Android App Download source helps users access trusted apps quickly, ensuring a smooth experience with easy installation, regular updates, and dependable performance on Android devices.
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Not only that.

I want it to be able to create those files too.

.

Also I want to control other apps with Lumo too.

Like on my phone:
Calendar, Home app, Notes, the Clock (like alarms), Mail, Messages, Spotify, Audible.

And yes, those features definatelly should be OptIn per App.

Unfortunately, Proton still does not support .ods or .odt. What is the reason for not supporting open file formats? If Proton want to be an alternative to offerings form Microsoft and Google this does not make sense.