Shopify Marketplace Connect

I just spent an hour and a half setting up the first two products for all 5 Amazon marketplaces we have properly connected. After an hour and a half of work, I found that my work is not saving. Title, pricing, product category, tags.... this is desperate. The app is paid, so one would expect these basic functions to work reliably.
The app works as poorly as the previous app from Codisto, which I tried and uninstalled after 14 days. It's the one that only allows connection to one marketplace.

Viele Einstellungen kann man nicht tätigen und werden gar nicht erst angezeigt. Leider absolut unbrauchbar!

Amazing app and great support! Ediline was really helpful when it came to setting up the shipping settings. She did an amazing job and went above and beyond to help even more.

Customer service is very helpful. They were able to help me get set up when I was having trouble. So far I am liking the app.

I tried this tool to import my shopify list to ebay, the result was completely unsuccessfully, the lists were created without VAT so they all had 25% less price, the list were created with a paypal account inactive, the list were created without shipping costs, I had to cancel orders from ebay due all this mistakes, can't get the money, can't chage the lists, a COMPLETELY NIGHTMARE and the MOST important thing - **WATCH OUT* . they still have access to your store as soon as you uninstalled your app from Shopify, you need to ask them to cancel "another account" otherwise another account remains active with them, they sent me screenshots proving that, then I got an email saying that it was not true ( I got asked twice if I wanted to cancel also their account with them) And apologize for the confusion, what a customer service, what an app, stay away if you have a lot lists, instead of saving time, could create more and more headaches, NEVER AGAIN, STAY AWAY.

due to an app developer answer, I'm going to update my review with their almost harassing e-mails:

Firstly I would like to correct an error that was made in the responses you received. Uninstalling was enough to disable the app. Nothing further was necessary. Apologies for the confusion on that point. It stems from the fact that the other e-commerce platforms we support behave that way due to limitations of those platforms. It is not a limitation that Shopify has.

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Please, lets fix this. At the very least, remove your review. It is not fair and not factually correct.
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I had almost to ask to stop sending e-mails:
Stop sending emails,

this is the last time we are having any kind of communication.

like I said before, all the best ( I don't have anything else to say or add)

WATCHOUT - again, the software is not working correctly ( not user fault) customer service is not working correctly, they asked to remove my 1 star review, and the answer provided here it's only for clean their image,

this is so far my experience with them, I hope you don't have to deal with the same.

Great customer services support. Working on listings now - hopefully will be up and running today thanks to the support help

correction: the app itself remains slow, however with a little practice you get to fix the gaps that the guide does not mention. There remains an app which, by paying for it, does not return the satisfaction of completeness, after all we are talking about e-commerce, on google I manually modified 600 products because with missing information, not supported by shopify, on amazon I will have to manually enter the products and then connect them to the app, which without the asin codes you do nothing, but the codisto app doesn't explain it well. It's just an analysis and linking application, demanding even for what it offers.
should categories in multiple products be put to each individual product? yes.
Was the developer first rude and then kind? Yes. You have the right to review by expressing your opinion. If other sellers have found it good, good for them.
Created ebay account with codisto, no code to apply: products not visible due to the NON-seller account from the app created, Walmart? Only if you're based in the US? option blocked? This isn't the app's fault though.
However, it shouldn't be called multi-channel selling but a linking showcase.
All in all though, for what it offers... it works. ps. don't blame the customers who find errors, it's not the caches fault... spend more time fixing the application.

Dearest Nikki, I see you are arrogant about one star reviews but you have 39. Please do not contact me unless asked otherwise it is called harassment. I blocked calls, don't make me block emails and report you.

Top pour gagner du temps et gérer son stock facilement! Tres bonne communication avec Ronel . 5 etoiles

I tried this App and did find it useful. Although I then found out about the 1.9% transaction fee on top of the monthly fee for the Flexi. Deleted immediately!

Pretty easy to use after you configure everthing up. Any doubt you can ask them and will be helped by one of they supports