Export/Import Data (old appl. to new appl.)

Export/Import Data (old appl. to new appl.)

I created a new application with 2 more fields. From the old application a mede "eport data" in excel - export data from the new application to compare the fields -
modified the excel from old to have the same fields as in the new one. Upload crashes - I tried a lot of things to maked work - but never happens.
other idea - duplicated the old one - tried to upload the data - bad luck -
--- can you help me please ---

when zoho ask to "upload again" or "cancel" and I push cancel - the screen stack "ligth grey" and I have to restart zoho !!
zoho-admin