Uploading an .osm file in JOSM and Level0

Hello,
I feel a bit stupid - but how do I upload an osm-file in JOSM? When I load it into JOSM, the upload arrow is grayed out. Unifying my file layer with a fresh download of the same POIs doesn’t change anything. The layer state in the file’s header is not set.
I had been working in the very file in a text editor and now want to upload my changes. There must be a way but maybe it is just too late in the evening for me to see …

Same thing in Level0. Nothing had been changed, so nothing to upload, Level0 tells me. Not at all, each POI I am trying to upload has been changed!
How do I get this done?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/uploading-an-osm-file-in-josm-and-level0/7955