I have been trying to find a clue: Retaining the private texts to be publicly available. This might be the key as the hidden ones are those linked to the DOI.

However, it gives a non-disclosed error as attached.

Any help?

Thanks

Could you please provide the title of this publication and the DOI? to check these? And what is the size of the file? ResearchGate seems to have a file size limit of 80 MB.

Thank you Dr. Wolfgang R. Dick for offering to help. The title of the publication is: Spatial Interpolation of Ham Radio Data, International Space Station Observations and Particle Swarm Search in Galileo-Based Modeling for Ionospheric Total Electron Content Estimation.

URL Poster Spatial Interpolation of Ham Radio Data, International Space...

• DOI: 10.13140/RG.2.2.16098.95684

Size: 1.96 MB.

Thank you.

Now I understand the problem. The DOI generated by ResearchGate is no longer connected to the file. Note that DOIs are identificators for files (or "digital objects" in general), not for publications, although very often they are treated like identification numbers for publications. See the help page https://help.researchgate.net/hc/en-us/articles/14293044585745-ResearchGate-DOIs: "Once a ResearchGate DOI has been generated for a research item, you’re no longer able to edit that research item. Instead, you should remove the research completely, re-upload it with the edits and generate a new DOI." I think you can solve this problem by deleting the current DOI (see "How do I edit my research item's details?" in https://help.researchgate.net/hc/en-us/articles/14293081125777-Reviewing-editing-and-featuring-your-research) and create a new one.