Actually 1 csv file and 25 png image files. The aia is 1.9MB in size, the csv 5KB and the sum of the png files around 87KB (at the end I would have less then 100KB).
What do you use to combine the button image with the button background? Are the final image files 24bit zero compression PNG?
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I use paint.net the final images are 32bit format... png are always compressed, it is a lossless compressed graphic format, in my case one 3KB png is equivalent more or less to a 28KB bmp. I can make a test with 24bit format and different image format, that is not a problem. What graphic formats AI2 support? I thought at least jpg and png so I tested for png and used it.
It is the compression that can cause issues. Also, once the App is loaded onto Android, zero compression works best because Android does not have to decompress before displaying them. PNG is a good choice because it scales so well and yes it can be saved uncompressed.
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32bit is absolutely fine for small images that require transparency (exception being the launch icon that should not use transparency).
So I think the files causing the issue are not 100% perfect in some way. You could try running them through a batch process, using something like IrfanView.
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So you think the problem is not related to AI2 but as far I may understand, every file should cause the problem because I made them following the same procedure. If I am not able to upload a file but I remove one or more files and then I retry to upload it (normally) it works. Seems more a problem related to memory or disk space or number of files.
If you are not exceeding the 30MB limit, it should be fine. It might just be that the Servers were over-reached at the time. We have seen Servers fail in recent times but a new system has since been defined and new servers installed. However, your Project is small, your images are small. Should be perfectly fine unless there is something wrong with the images.
Another possibility would be a broadband issue on your side..........?
I tested also using AI2Offline and it has the same problem
....which led me to believe it has to be the files, though the Offline versions are not associated with MIT and are often more than a bit rocky (and always out of date).
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The problem is not related to png files, after converting them to not compressed png files things went worst... the problem arises after only 21 files instead of 27 if I use the original files (yes, 27 instead of 25 as initially), honestly I do not know what is the difference, I am sure that I did not upload them in the same order because I added the files as I received or as I realized but now I uploaded them in alphabetically order as proposed by windows of course. But does not make much sense to me. In my opinion there are some internal limits and functionalities we do not know as we should.
I installed AIO2Offline nb187a and nb187b (also if the about rreports also the b as a), anyway it is not so far from AI2 online: 
I need so many files because I need 3 images for each button (with one exception for the home button that needs only 2) and I have 2 different button shapes all without text and with an image/icon/glyph inside as in these examples:
so there is one type of button that needs to be an image but the others may be a button with inside an image... but the standard Button does not accept graphics instead of text and until now I did not find an extension working in AI2 that may realize these type of buttons.
Send me your original button images, plus the CSV file, in a zip file.
It actually does - so what component are you using as a button?
I mean it accepts only an image for all the button not an image that I can put on it as it was a text.
... I realised that but my internet connection froze so I could not edit my post 
What happens if you create a new empty Project and load all the images (drag and drop) into the media tray?
Seems that I can upload a lot of files more, I uploaded 32 png files (original format) and the csv file without any problem. Now I could try to copy all the project using the backpack to see what happens.
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You can copy a Screen in the Designer just by copy and paste. That carries over related Blocks too, but not unrelated Blocks - so delete the Blocks that arrive with copy-paste and then use the BackPack to transfer all the Blocks of one Screen.
Hi
Im working on a project much bigger, and I have the same error message any time my Internet connection is not fast enough.
It improved a lot when I changed from DSL to optic fiber (with higher bandwidth).
And I got the error back all the time if I try to work on mobile data (I need to wake up early in the morning, when everybody is sleeping and I can enjoy most of the mobile bandwidth just for me).
Hope it helps