About the format of attachments
The attachment formats of the forum are very limited. Some formats cannot be uploaded, but most cannot be downloaded. For example, if the format of your file is a similar format such as swf or rar, the file cannot be downloaded and an error will be prompted. The formats that can be used now are: zip, jar, some formats of pictures, not listed (but do not name files other than pictures as picture formats, they cannot be downloaded), mp3, apk. I hope everyone will use these formats to upload attachments in the future, and do not let the attachments go to waste.
