The a tag link under IOS pdf is a preview, not a download

as mentioned above, the a tag is directly linked to pdf,. Under ios, you can only preview but not download Android normally. How to solve this problem

Aug.19,2021

<a href="a.pdf" download="a.pdf">
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e64dff-45aea.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e64dff-45aea.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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