As an explanation to share with everybody here:
We recently changed our BTC API provider so that adjustments are needed in case of issues provided by customers.
And we are working on Top10 altcoin API wallet imports to make things easier for everyone that means importing transactions automatically. For more then 200 altcoins we rely on a third party provider cryptochainz. As a semi automatic solution we offer Excel and CSV Importer for importing transactions from wallets / exchanges in bulk.
A feedback loop does always help us to improve our software. And we are working on this improvement daily.
Thank you for your patience, testing effort and providing feedback.
Unfortunately the LTC address import is still broken for my job. I've updated the support ticket with the new details and believe have diagnosed the likely issue for the developer.
This isn't about being "happy" - this is about usability and trusting your service is accurate.