public/datatransfer: file downloads are corrupt (varying sizes)

[motmot80]

System:

• OS: Windows 11 25H2
• Browser: Firefox 152.0.5 (64-Bit), Chrome 150.0.7871.115 (64-Bit)

Error description

Downloaded zip archives (large) are corrupt and have different sizes every time the attachment is downloaded.

Reproduction path

1 - Check box

Download single zip encrypted archive with

• select an attachment
• download selected files (de: "Ausgewählte Dateien herunterladen")

2 - Download button

Download single zip encrypted archive with

• click on filename
• select "download"

Expected

Downloading a large archive file results in a valid file.

Actual

1100180668 Jul 14 13:55 my-archive.zip
1101047526 Jul 14 13:46 my-archive_2.zip
1100566775 Jul 14 12:57 my-archive_3.zip
1100566716 Jul 14 12:55 my-archive_4.zip

[zhenghongsenqq]

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