Hi, guys, finally I worked it out! The error is caused by Chinese names. I did mention they were all English name files, but some lrf files got a Chinese character title. If these English name lrf files with a Chinese character title are stored with other English name txt files in the same collection, these lrf files will just not appear in your 505 screen. The sollution to the problem is to put them seperately in different collections. Now my nightmare is over at last. Thanks anyway. I do appreciate your help.
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