large image can not be uploaded because localstorage quota is reached
the quota in chrome is 5Mo
current localstorage mem footprint:
1,1Mo for investigations 2,7Mo for scientistInstrumentInvestigations ----- total ~ 3.8Mo,
so 1,2Mo left for the rest including img blob in the logbook. Note that the blob is present temporarily in the localstorage until the image has been uploaded successfully.