Hi,

I can successfully use ZipArchive like the following

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zip := ZipArchive new.
{ 'file1.txt'. 'file2.txt'. 'file3.txt' } do: [ :eachFile |
�� �� �� �� | member |
�� �� �� �� member := zip addString: eachFile, ' contents' as: eachFile.
�� �� �� �� member desiredCompressionMethod: ZipArchive compressionDeflated ].
file := FileLocator temp / 'archive.zip'.
zip writeTo: file writeStream.
file.
-=-=-

What I should do to make it work while using FileSystem memory?

-=-=-
zip := ZipArchive new.
{ 'file1.txt'. 'file2.txt'. 'file3.txt' } do: [ :eachFile |
�� �� �� �� | member |
�� �� �� �� member := zip addString: eachFile, ' contents' as: eachFile.
�� �� �� �� member desiredCompressionMethod: ZipArchive compressionDeflated ].
fileSystem := FileSystem memory.
file := fileSystem root / 'archive.zip'.
file writeStreamDo: [ :stream |
�� �� �� �� zip writeTo: stream ].
-=-=-

There is "Improper store into indexable object��� as it tries to store a number in ByteString.
Thanks!
Juraj