It appears hard coded ENCODING with ISO_8859_1 in file src/protocol/http/src/main/java/org/apache/jmeter/protocol/http/sampler/PostWriter.java as following: public static final String ENCODING = StandardCharsets.ISO_8859_1.name()
Created attachment 38386 [details] Choose a File With Chinese Characters In Filename to upload
Created attachment 38387 [details] Step2. After the upload, it cant show Chinese Characters as expected
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/5701